CN2442280Y - 5.30 micrometer band-pass optical filter - Google Patents
5.30 micrometer band-pass optical filter Download PDFInfo
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- CN2442280Y CN2442280Y CN 00249226 CN00249226U CN2442280Y CN 2442280 Y CN2442280 Y CN 2442280Y CN 00249226 CN00249226 CN 00249226 CN 00249226 U CN00249226 U CN 00249226U CN 2442280 Y CN2442280 Y CN 2442280Y
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- utility
- model
- optical filter
- film system
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Abstract
The utility model provides a 5.30 micrometer band pass filter. A base board of the utility model is made of alumina, and both sides of the base board are respectively and alternately provided with a plural layers of zinc selenide films and lead telluride films through vacuum evaporation coating. The film layers mainly uses a wave film system designed structure and a cutting secondary peak film system with high cutting depth. The cutting depth is smaller than 0.1 percent, so background interference and cross-talk are effectively suppressed. The utility model is suitable for mass production and has stable performance; the utility model can be used on analytical apparatus for detecting trace quantity nitrogen monoxide in the field of chemical engineering, environmental protection, coal mine, medical science, etc.
Description
The utility model relates to the optics except that lens, particularly a kind of 5.30 micro belt pass filters that are used to select the desired gas infrared spectrum.
5.30 being infrared spectrum analyser, the micro belt pass filter is used to measure the critical component of nitric oxide gas content.For a long time, because its performance is not good, making always can not practicality with the instrument of infrared method measurement nitric oxide gas content.Its main cause is: carbon dioxide, carbon monoxide and sulphuric dioxide absorption peak are arranged near 5.30 micron wave lengths, and the nitrogen monoxide absorption peak is less, so the interference of contiguous gas seems more outstanding.
The purpose of this utility model is according to the nitric oxide gas ft-ir characteristic absorption peak, provide a kind of centre wavelength be 5.30 microns height by the depth zone pass filter, effectively suppress the interference at adjacent gas bulk absorption peak.
The utility model is achieved through the following technical solutions: promptly, make substrate with the alundum (Al of surface finish, replace evaporation multilayer zinc selenide and lead telluride rete on its two surfaces respectively, wherein first main film is to adopt:
Ns/HL (LHLHLHL)
2LH/ (LHL)
8/ No, second face mask series adopts:
Ns/L/0.412 (0.5LH0.5L)
6/ 0.583 (0.5LH0.5L)
13/ HL/No, the symbol implication in the formula is respectively: Ns represents substrate, and L represents λ
0/ 4 zinc selenide retes, H represents λ
0/ 4 lead telluride retes, λ
0Expression centre wavelength is 5.30 microns, and No represents air.
Because the utility model optical filter is had relatively high expectations by the degree of depth to cut-off region, so the main film system most wave structure films in employing arrowband are and add the stack of broadband cut film system that increasing main film is the degree of depth of ending of face.
Select high index of refraction low energy gap lead telluride material for use, utilize its intrinsic absorption characteristic amputation less than 4.0 microns secondary peak, and increase by the degree of depth.
Cut secondary peak film system and adopt two film stacking structures, effectively near the interference of the strong absorption peak of steam 2.8 microns of the amputation.
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail:
Fig. 1 is the structural representation of the utility model optical filter;
Fig. 2 is theoretical curves figure for first main film of the utility model optical filter;
Fig. 3 is the utility model optical filter second face mask series theoretical curves figure;
Fig. 4 is the utility model product optical filter measured spectra curve map.
Consult Fig. 1, the utility model optical filter comprises substrate 1, is Ns/HL (LHLHLHL) by first main film respectively on two surfaces of substrate 1
2LH/ (LHL)
8/ the No and the second face mask series Ns/L/0.412 (0.5LH0.5L)
6/ 0.583 (0.5LH0.5L)
13The designing requirement alternate intervals evaporation zinc selenide rete 2 of/HL/No, lead telluride rete 3.Said substrate 1 is the alundum (Al material, and profile is decided by actual needs, and thickness is between 0.5-1mm.Plated film adopts reflective strange level time straight indirectly control photoelectric method monitoring thicknesses of layers, and the bearing accuracy of optical filter centre wavelength is at ± 0.02 micron.
The optical filter of the utility model preparation is through adopting the test of U.S. BIO-RAD FST-40 type Fourier infrared spectrophotometer, and its curve of spectrum performance is seen Fig. 4, and concrete measured performance is as follows:
1, the profile of finished product: 10 millimeters of diameters, thickness 0.5;
2, central wavelength lambda
0=5.31 microns;
3, half width Δ λ
0.5=0.25 micron;
4, form factor Δ λ
0.1/ Δ λ
0.5=1.44;
5, peak transmittance T=76.7%;
6, cutoff wavelength: shortwave long wave secondary peak all ends T
C＜0.1%.
In sum, the utlity model has following useful effect:
1, optical filter reaches good technical indicator, and the centre wavelength with uniqueness is 5.30 microns band The penetrating spectrum of crossing, the cut-off limit is more precipitous, ends the degree of depth less than 0.1%, establishment ambient interferences and minimizing Cross-talk.
2, technical solutions of the utility model reasonable can form batch production, and filter performance is stable.
3, the utility model optical filter is applicable to that the fields such as chemical industry, environmental protection, iron and steel, colliery and medical science are little Amount nitric oxide infrared gas analyser device uses.
Claims (1)
1, a kind of 5.30 micro belt pass filters comprise the substrate (1) of a twin polishing, and alternately evaporation multilayer zinc selenide rete (2) and lead telluride rete (3) respectively on two faces of substrate is characterized in that: first main film system adopts:
Ns/HL (LHLHLHL)
2LH/ (LHL)
8/ No, second face mask series adopts:
Ns/L/0.412 (0.5LH0.5L)
6/ 0.583 (0.5LH0.5L)
13/ HL/No, the symbol implication in the formula is respectively: Ns represents the alundum (Al substrate, and L represents λ
0/ 4 zinc selenide retes, H represents λ
0/ 4 lead telluride retes, λ
0Expression centre wavelength is 5.30 microns, and No represents air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00249226 CN2442280Y (en) | 2000-09-14 | 2000-09-14 | 5.30 micrometer band-pass optical filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00249226 CN2442280Y (en) | 2000-09-14 | 2000-09-14 | 5.30 micrometer band-pass optical filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2442280Y true CN2442280Y (en) | 2001-08-08 |
Family
ID=33607701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00249226 Expired - Lifetime CN2442280Y (en) | 2000-09-14 | 2000-09-14 | 5.30 micrometer band-pass optical filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2442280Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242339A (en) * | 2015-10-13 | 2016-01-13 | 南京茂莱光学科技股份有限公司 | Four-color optical filter |
-
2000
- 2000-09-14 CN CN 00249226 patent/CN2442280Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242339A (en) * | 2015-10-13 | 2016-01-13 | 南京茂莱光学科技股份有限公司 | Four-color optical filter |
| CN105242339B (en) * | 2015-10-13 | 2017-09-05 | 南京茂莱光学科技股份有限公司 | A kind of four colo(u)r filters |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20100914 Granted publication date: 20010808 |